Latex: how to align subcaptions on the top left and caption to the right of the figures - latex

Question

I am using LaTeX to write a report and I'm going crazy to get a result like
with subcaptions (a), (b), (c) align to the top left of the subfigures and caption on the right of the figure.
I've already tried with floatrow and subcaption, but I've never obtained the result I want.
MWE:
\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{floatrow}
\usepackage{subfig}
\floatsetup[figure]{style=plain,subcapbesideposition=top}
\begin{figure*}
\ffigbox[\FBwidth]
{\begin{subfloatrow}
\sidesubfloat[]{\includegraphics[width=.5\linewidth]{image1}\label{fig:a}}%
\sidesubfloat[]{\includegraphics[width=.5\linewidth]{image2}\label{fig:b}}%
\end{subfloatrow}}
{\caption{Two figures}\label{}}
\end{figure*}
\end{document}

Answer 1

Here some starting point with the subcaption package (the exact dimensions might need some tweaking to nicely align with the surrounding text)
\documentclass{article}
\usepackage{graphicx}
\usepackage{subcaption}
\captionsetup[subfigure]{font={bf,small}, skip=1pt, margin=-0.7cm, singlelinecheck=false}
\begin{document}
\begin{figure*}
\hfill
\begin{minipage}[b]{.63\textwidth}
\begin{subfigure}{\textwidth}
\subcaption{}
\includegraphics[width=\linewidth]{example-image-duck}
\end{subfigure}\par
\begin{subfigure}{\textwidth}
\subcaption{}
\includegraphics[width=\linewidth]{example-image-duck}
\end{subfigure}
\end{minipage}
\quad
\begin{minipage}[b]{.3\textwidth}
\caption{some caption with aligns at the bottom}\label{key}
\end{minipage}
\end{figure*}
\end{document}